Rena humilis
Silhouette: Jessica Tingle · PhyloPic
In 3 days ~20% in a week ~40%
Rena humilis, known commonly as the western blind snake, the western slender blind snake, and the western threadsnake, is a species of snake in the family Leptotyphlopidae. The species is native to the southwestern United States and northern Mexico. Six subspecies are recognized as being valid, including the nominate subspecies described here.
R. humilis, like most species in the family Leptotyphlopidae, resembles a long earthworm. It lives underground in burrows, and since it has no use for vision, its eyes are mostly vestigial. The western blind snake is pink, purple, or silvery-brown in color, shiny, wormlike, cylindrical, blunt at both ends, and has light-detecting black eyespots. The skull is thick to permit burrowing, and it has a spine at the end of its tail that it uses for leverage. It is usually less than 30 cm (12 in) in total length (tail included), and is as thin as an earthworm. This species and other blind snakes are fluorescent under low frequency ultraviolet light (black light).
On the top of the head, between the ocular scales, L. humilis has only one scale (L. dulcis has three scales). R. humilis is found in the southwestern... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Saguaro National Park | 🇺🇸 United States |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | San Diego | 🇺🇸 United States | |
| 2 | Los Angeles | 🇺🇸 United States |
No species of the same family or order lives in Saguaro National Park, so these are its closest relatives here: other reptiles.
With luck
About 10% of wildlife watchers report a Western Threadsnake sighting in Saguaro National Park on a given day, based on 21 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 37th most-seen of the 51 reptiles we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
April to November
In those months about 10% of wildlife watchers report a Western Threadsnake in Saguaro National Park on a given day, against under 5% in December to March, the lowest months.
Between 8 and 11 pm
Across all the parks we cover, that three-hour window holds the most Western Threadsnake sightings with a recorded time, and about 8 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
Only Saguaro National Park, in our data
Saguaro National Park is the only park on Wallace's Line with enough records to rate Western Threadsnake sightings: about 10% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Western Threadsnake is recorded against all the reptiles logged in Saguaro National Park (21 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
